| 11. | He tried to establish a business of manufacturing and selling calculating machines, with unclear success.
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| 12. | Calculating machines did not become commercially viable until 1851, when 9's complement method for subtractions.
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| 13. | So, he invented a " calculating machine " designed to ease the monotony of clerical work.
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| 14. | He developed a rotating camera and calculating machines.
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| 15. | He took great interest in mechanical calculating machines.
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| 16. | Helmut Schreyer ) and Kurt Pannke ( a calculating machines manufacturer in Berlin ) to do so.
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| 17. | He also constructed an early calculating machine.
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| 18. | Wiener used the term in reference to " calculus ratiocinator ", a calculating machine constructed by Leibniz.
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| 19. | Among them, ones of antique slide rules, early calculating machines, and maps that chart the evolution of cartography.
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| 20. | The name comptometer was formerly in wide use as a generic name for this class of calculating machine.
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